v3.26.3
LONG-TERM DEBT AND SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Oct. 31, 2026
Jul. 31, 2026
Jul. 28, 2026
Jun. 30, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Preferred stock, shares authorized (in shares) 4,400,000       4,400,000   4,400,000          
Preferred stock, liquidation preference (in dollars per share) $ 1,000       $ 1,000              
Common stock, outstanding shares (in shares) 144,943,000       144,943,000   147,653,000          
Common stock, par value (in dollars per share) $ 0.001       $ 0.001   $ 0.001          
Common stock and additional paid in capital $ 1,536       $ 1,536   $ 1,726          
Share repurchase program, authorized amount $ 300       300       $ 75      
Common stock repurchased (in shares) 1,100,000 1,200,000 1,300,000                  
Shares repurchased $ 75 $ 75 $ 77   227 $ 41            
Shares repurchased (in dollars per share) $ 69.58 $ 61.79 $ 60.79                  
Accumulated other comprehensive loss $ 7,684 $ 7,681   $ 6,865 7,684 6,865 7,180       $ 6,596 $ 6,124
Unrealized loss amortization associated with the securities transferred from AFS to HTM 44     47 127 137            
Subsequent Event                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Share repurchase program, authorized amount               $ 72        
Stock Compensation Plan                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Shares repurchased     $ 2                  
Accumulated other comprehensive income (loss)                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Accumulated other comprehensive loss $ (1,989) $ (1,867)   $ (2,056) $ (1,989) $ (2,056) (1,941)       $ (2,164) $ (2,380)
Series A Preferred Stock                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Preferred stock outstanding (in shares) 66,139       66,139              
Fixed-Rate Available For Sale Securities                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Unrealized loss amortization associated with the securities transferred from AFS to HTM, before tax         $ 1,400   1,600          
Unrealized loss amortization associated with the securities transferred from AFS to HTM         $ 1,100   $ 1,200          
4.48% Fixed-To-Floating Senior Notes | Senior notes                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Debt instrument face amount     $ 500                  
Debt instrument stated interest rate     4.48%                  
5.24% Fixed-To-Floating Senior Notes | Senior notes                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Debt instrument face amount                   $ 500    
Debt instrument stated interest rate                   5.24%